From GNUCap manual:
“This command is considered obsolete, but the replacement is not working yet.”
I'm a bit surprised there is people making new versions of #TECO. This version has a much cleaner code base than TECOC and is well documented.
spend the whole afternoon to hack the SAX parser of blahtexml to get the idea syntax for embedding MathML in DocBook.
I found on macOS there is a command named "lsm" added recent years which is capable of classifying junk mail.